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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b330d8fb6b89b0fb3c64d5526fe70e9c50658fc8875ebf735ade9c3a8a261d01' 
  AND token = 'mMuoB5085CBkOL7Zs06iZPMC3ksq7u7Ibf++mFk3Teg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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