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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e88da4a256704a38d89da471eb4faebfbdd6e2267688bf37df8a4ec257f32aa' 
  AND token = 'D3AQ7EPn9P12e75QbEy9C31BS/vqoYcC6gA3xI0EapI=' 
  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"
    }
  }
}