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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0015c740746c053401e86771c0edb157816ef04268de1e356acac1a4845a2579' 
  AND token = 'SaR3vCBdKZs1KRTnaAEX8M+tLpFxQVOrhFP1H1Iu/g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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