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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea4f90838d45da4b1e2c75358e59d61cfeafef3c1c34ef00eadfd4e3267c8a5' 
  AND token = '9a1z7h0695i6GFznMETR3h2j8yo1eb5peLROj6dnHF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}