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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3957fda4924f74c3f842029ba7c45f6d5ae56697c7940285044626c9fb21e84b' 
  AND token = '8l3NTO2Rq0fNY9mTaxvEk3kxb1dpTlMyKjwfAtii89c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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