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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0234ebd079d99b95029607f34b5bed75ee6b9b05c5f7799918957de60dc12ea' 
  AND token = '0PYl5G/MmO5ckmjNwHKnSqsM8BkE+MG0ol/N+RBhUG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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