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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7913a1856a418ec752a9af1e39cf5dd2885c179f43fe20aec9129ce8a7a70d' 
  AND token = 'pQ8FpEgG1euWzYX/GleUOhN8QjSwIi+CsfIA5zA4bDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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