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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12136ec039e84d8bb1ba946bfed76d44dab41d601e1f0ef853afbb0f3c00449' 
  AND token = 'u+Sq4Lib1skadX/6JKUGiXcNdO+6UTlASFGBk/nGokk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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