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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea13782861a038ed7f72fedf675bf4586daf6f71fb783e783a992813a4c255f5' 
  AND token = 'BlxazRtc3xrEc3qp53MoLtu1JdoDS4FSXg+L0zara6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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