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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a3a42a12d9ac13b1b165f537311c7449c9ad46d6f1ae8f72d2237a44f7eff0' 
  AND token = 'qEGM0aeGhIfTRXSkkNE27/UX6/jtXjCdCz+mLKewfec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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