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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b982fc0b569fc610ac9b2717a09790f593b620fa0181185e3b32b499cfd1496c' 
  AND token = '+K1+kQ2Hs5FO4qgn0seaigxUflotebK1ThCPITIzfeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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