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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0ab8e7fff629898857afe2414e82ad10581e7fdf21de58bbec5a9f6ca54aa5' 
  AND token = 'gDHQZ74ewoXwa4W56GcJ3R9D4ewXAyYakw4CIDnH26Y=' 
  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"
    }
  }
}