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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201f77122eb21d5cfba27b9798ab196c8d0dbec445ceb541b72973938085e740' 
  AND token = 'jTEqUzOB2e2LnqBfLWd+solTL2phiw/u6NhaEpIeDbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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