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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eef21f7528e40650c952ee27ececaf760ee5fbfc724998f7eb2cf8f8588045d' 
  AND token = '8rCcF7Te2O9GD1xfCO8K1GG7fFLOZZaRz5UwZTCN9VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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