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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba1010ed1b5cd29a31573e3add49840bd304136d90a75897afd52e8a8fe4b51' 
  AND token = 'GqBooOfnmdqVAM1Z9JCR89LGYsrNzX2wi5g8dne29pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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