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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbd44f01b2518680d11b3168ddf3d1eeede2662ee6f658685e35881ed4a0dfa' 
  AND token = 'kPg9xPvYhKd0fgis9gDMuafMk+AZMU2hCvC9VkZ3a4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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