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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812dd5e63fc2fac438c1f45a38cdefd2b101c248cb3922dde96ba944aa8f3832' 
  AND token = 'IvioPjedIwqEMWlfPMkJ90iQF3Vr/mJov9Gc2+6aaL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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