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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109d5108c55930736674d0f642be1db7e235e80d8e0ba9bdeb3d5c77c206cd55' 
  AND token = 'du7/mc5VVJvXxc7xpwQir9SmQuY1WU1ncpp7TVm5lp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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