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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3fa14bd6e7b4b91f2c711f6d9528c572d17c0e3c6dede4e248688fb13ef4a1' 
  AND token = 'Y5kKRQZWglFCz0gVaQDa7hxctkR1NhzJCM+L6lHT0P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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