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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2e0b6560cc5cf8a94022f367a0c6965f40aa6d7921bccff02b7e680fc82970' 
  AND token = 'Yt6Tmihvvj0dXV6ZxmAcitUcSegki72d2W9jdI6Inss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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