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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d95acc951c8666a99b29491d6c94043c5021a09bf4e988ab902760a5c53ed2' 
  AND token = 'EBD53iYHyITrrB3xBFHVd+zgiKiIj4o1ROrCvSt/1Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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