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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb0df0c0f6227b1f31daeb19ab2d4174655643d97b60523e6664b9ae69392d4' 
  AND token = 'umkp0M3N3A2Uohsfijzo3VWejHBWepXgWKV9fBxZjuw=' 
  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"
    }
  }
}