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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a02e2d112e5f559755736d4b3c31066d4189b4b4be373cb34dc9b11c06c3886' 
  AND token = 'oacvROlAstnxLviQ3KPA00oxhO9kWoC9KoZLinRhgd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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