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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21773850f2789b067208c5fb199432fc9de02f4e3e0e74d5d69d3651d1eae1cf' 
  AND token = 'fQUnPLbNBPsLDkIFcxOoDaM9n9vNqi802AYY59bBKpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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