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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c76b1f9b0c5da5147d820882ba7302a52f7693a1b0f91f8ce1ed167175f8237' 
  AND token = '7Q5VhFB96dAIb81Y6pB4mmQsHM6o2T2gwxxh2pwxswc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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