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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c608e9e1c7c0cefb0d626e7e1ff4943f79147b24dd0393461d784fdbb4bd8d41' 
  AND token = '4scAcY61Jj0CMwLcKFgLuY/tO5u6/hYEvErGSCiKfrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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