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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8eaaa0b70fec15787327aeb9da8f6bc79e1faf00190d34d63a19ad8de94f7a6' 
  AND token = 'EL9m00MxGG8d8pCP5Bo1rGNcjKVQkZQdssuzT7Miew0=' 
  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"
    }
  }
}