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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9171e7f131f89ac79f517602b26d6c83def585f6a1aba723535a91f3b3b20544' 
  AND token = 'PiCkmu7eZE4ZSBIqiFr9/nr7m9nln7KEMF1hO0lmEOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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