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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59f243949163593d57fca454c316ca37e2e195923383dd99b1a7a4f5e17ea0e' 
  AND token = '9BFB8UWsop9lrFvRms5R33Xud9BWMstf4TVfKryf0Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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