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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ddb8d6158b538bc3cf2decf485203d1ffe1cfa3156264f610032f853f9d1bc' 
  AND token = '6xxWbY1bXkynAOV6jx3/c1m+ox4vr9RsvkUyiFLCnsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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