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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88ee69df54c32199777412f6892edc4aeb37e04d38b4253c85fd8ff4a12e0ee' 
  AND token = 'mghLeMC8vumrCVXlkwb0MvZyYMcMXdY2lTcsr6eC3oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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