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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab369d9bd3c0eab79c9dee478bef0b64ff2e724b5f032b83966e1a896e88170' 
  AND token = 'W4mhAdHx0KDy5f91nAa8IXukqZRPUfnC9zJNaZHJ+Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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