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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941a5c289c6d60c6a1ea8234a82aaa53ea3d7d81f588b782e963b8cbac31802a' 
  AND token = 'y4dHVrYN14Cfb/H0uXlsMwQIlpIFs0F53129r0ZQSkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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