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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502f3d6471c396f911e9fd6deb66d7aa9ddccead546a5c178e3969b32b668f88' 
  AND token = 'Q5a0uEdt8Tic/PlNTF45QaWqbhBDwlPTtGk0BSSAiM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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