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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6144bee7aa89e1c1e632aeb53e8f9bdef9bc0977e40b7f6f338d279a6fa6159' 
  AND token = 'ymQWFR/jmR1DayynQsVww/Zm5aeUIznyf0ZKD9kqiF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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