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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53bb1888af42bb2ef71175bd5f80202deceea111b3c25ee65bf56f34ed316f52' 
  AND token = 'OgxfzclVEF79X/ZNYlJU/6yPcymSywLBOf0eeWWj88M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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