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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064fe0ebfde328e49eb92342fb101c2174a3897c4c42d6c51236e7abddd65384' 
  AND token = '84LfzDQXI8e3EfSaLUNHfuoGCy2cCVA0iGy+WHVIT4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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