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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6581e2c6e29ac9443906e6192f33f43fcd05f4aeaf3ff896ea63e98126ee66bf' 
  AND token = 'WFw0MUyNlze7uaua3s7jbBwvtk3WieOmQfhXJ46LqX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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