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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465e0c16ce30fe018459b0fcadb54cd6b60c37646f558d3505502ecad5cad687' 
  AND token = 'IihkkEEJKXr1h1cC2fBMaOn7eZV2dIKvcGw+F3qE+TE=' 
  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"
    }
  }
}