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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c908910b92e7fe09c7e8eb6fb1f69f4b9961c79aa646d6cb97c44abde7404df7' 
  AND token = 'LzJ57yQ2XnL/7lmHoPo4i1jSnzkP9ZOoXO+Mx2dNsk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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