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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaaf8641486caad6830611f6bfda4d1dd2b86eb86fb2b87387196edebea9062d' 
  AND token = 'u2Uaf70OOuR+d+WZ6NaCDGxPfjXGSmRf5XD/ZPv05z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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