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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99cd94208541d1c973b695b1f8c6bc6d8f6b1ec7cb0a566295fbb7cdfcfbd01' 
  AND token = 'Q0TPWzrM5EhwXnunTcSEh3eUeLm/IiNdvu0SzVzjXnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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