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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14111c1c5481ef4db0960d80aaa0e618d7b8cd51552f4a7b60c9fb116c7c9690' 
  AND token = '9SvIFSBXyYIB91x75/CeLLj6Y1/kJjBwT3dYd4n+W6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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