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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970d90aaa6176bb4c661f33c04b482930f1fc98fc6887279578a2298151d67db' 
  AND token = 'd4HTHct1UOlh+nFvbVWchy1V3ta5i4euIhkI/8Qo62Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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