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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5966e6e5aa0a6163020135f6a1d2dbf74dfcd15049092a36dc06a190fa0422c7' 
  AND token = 'RpfR60iuwK7NdZBncsLg8GAYtf8x0O4CEM4lE8U7P/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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