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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27648b5928f3c60464f1ab7fb2055dd0ead9a38c120317dde98c31d0885caac' 
  AND token = 'H+5agQcedq07W+KjiTz4O/S8yvyanNA6Mnr0O4gMT20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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