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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4948c81213c9703c289e7d8f31eb3309d75f4fbb46795caacfbff0012a1c98b5' 
  AND token = '9awpO58e8FyiGm9o+ypvze3IvJsjxJuGfWCZyeA4Xx0=' 
  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"
    }
  }
}