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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd49308a002fc29bb5df670a94191ff47d1506cac4ce993556e7b39510f9b84' 
  AND token = 'ajt72IMEPWNAdO0sySNxHMMoDusc7C4c4S5ZkOkCVYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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