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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2185dc71f9bb18fd2337b12648eb34d6337db0319027a1bb5a447b11fc521d7' 
  AND token = 'b6hD4mP9/3aTTueOq/rZGicNaLe0m/3pTqCI0OpWdco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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