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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3922447ab292178a772a74c9b94213cbf90a598b8da5305d2255a0049c08041' 
  AND token = 'VWUFmXOci71vgQJ28/BrGi8bvkximkXK+oVxj6Eh8ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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