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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236ac89d385c145e29346023cb8822bd5a2035d749cf060660e38ae321ef6902' 
  AND token = 'iCxxAScBt+tlhhcXQUloIwb1riRAksAHrLNrvTv7ooI=' 
  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"
    }
  }
}