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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cd76d70edf7f23f1962ec4e480b83bed0b8223fe9441076d109d77f5a9e7e3' 
  AND token = 'dta+C691O3FZbs6AMsEe5QwX6QP13enSpIn5naIysbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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