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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f2108d95fbbae6de24ed77164f2cd304945b59fd708f2fc4ef91990aa8c1d1' 
  AND token = 'IqEn2jfxK7uFmaq/LWDQWtWM2ju/84mDXxHG6s9UdqY=' 
  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"
    }
  }
}