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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6985cce0359fa9a71bfbdd27818a0f863a5a44f6d96e8a3b37293d11619b1ded' 
  AND token = 'Fzql3Iz+mKti/L4hWcjTW1IC1clU9iPy63JBzkd8Kos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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