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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c293f2b5ae3ee81e7c7f652cb0bd44db4a351cb24c22c71731d726f1c3c79e01' 
  AND token = 'uk105Qh1SOaYkN3OsuSB6Cjik1bRoZ5x5YkRgW3YPuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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