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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eba843bf60f4aca6990d8a9c07e6c01e1169a6518200fa8e9158b049e7e46c6' 
  AND token = 'w98b4lWidOAF2GrvjUHkpR9GnTxCdtMtB6PLdJLWZsQ=' 
  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"
    }
  }
}