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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a68dddd5ea2c34b9f20d9429e72f145063deef95e892d916a50a2992fc950f' 
  AND token = '+YXfJkRsjTkOFxqvHlzv7ulcgza9tEHWl5Lc1+qkmco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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